#include <59header.h>

int main(void){
    size_t size = sizeof(mode_t);
    printf("size mode_t = %lu\n", size);
    bool flag = (mode_t)-1 > 0;
    if(flag){
        printf("mode_t是无符号的!\n");
    }else{
        printf("mode_t是有符号的!\n");
    }
    return 0;
}

